OneBeacon Professional Partners Expands Directors & Officers Coverage for Health...

OneBeacon Professional Partners Expands Directors & Officers Coverage for
Health Care Organizations, Nonprofit Organizations

CANTON, Mass., April 29 /PRNewswire-FirstCall/ -- OneBeacon Professional
Partners, a member of OneBeacon Insurance Group (NYSE: OB), today announced
two new comprehensive management liability insurance solutions designed
specifically for health care organizations and nonprofit organizations.

The Health Care Organization Management Liability product offers coverage to a
variety of private and nonprofit organizations that offer health care services
including: hospitals and health care facilities, long-term care facilities,
managed care organizations, physicians and medical groups, and miscellaneous
medical facilities. The Not-for-Profit Organization Management Liability
product is available for nonprofit organizations of all types and sizes,
regardless of financial size or employee count.

Both products are modular in nature and offer four lines of coverage:
Directors, Officers and Organization Liability, Employment Practices
Liability, Fiduciary Liability, and Crime Coverage. The products offer up to
$20 million in capacity, with primary and excess options available.

Stacy Kniffen, assistant vice president of management liability for OneBeacon
Professional Partners, said, "Our management liability products are quite
flexible, which allows our clients to design programs to meet their individual
needs. We also offer the choice of separate limits for all coverage sections,
or the ability to share limits among the liability coverage sections -- and
one convenient application for all coverages."

In addition, these products offer brokers many cross-selling opportunities
with OneBeacon Professional Partners' medical professional liability products,
as well as with OneBeacon Commercial Lines' property and casualty coverages
for small to mid-sized facilities.

For more information about these new management liability solutions, please
contact Stacy Kniffen at 212.549.3540 or SKniffen@onebeacon.com.

OneBeacon Professional Partners is a member of OneBeacon Insurance Group that
specializes in professional liability solutions for targeted industries
including hospitals of all sizes, physician groups, managed care
organizations, long-term care facilities, health care facilities, media
organizations, real estate professionals and lawyers. Additionally, OneBeacon
Professional Partners provides Employment Practices Liability Insurance,
Management Liability and tailored products for complex organizations including
health care provider excess insurance and HMO reinsurance.

About OneBeacon: OneBeacon Insurance Group's underwriting companies offer a
range of specialty and segmented commercial and personal insurance products
sold through select independent agents, regional and national brokers, and
wholesalers. As one of the oldest property and casualty insurers in the
United States, OneBeacon traces its roots to 1831 and the Potomac Fire
Insurance Company. Today, OneBeacon's specialty insurance businesses are
national in scope, while commercial lines business is produced in select
territories throughout the United States. Personal lines business is
concentrated in the Northeastern United States.

OneBeacon's U.S. headquarters is in Canton, Massachusetts. The company is
publicly traded on the New York Stock Exchange under the symbol "OB".

Safe Harbor Statement under the Private Securities Litigation Reform Act of
1995

This press release may contain "forward-looking statements" within the meaning
of Section 27A of the Securities Act of 1933 and Section 21E of the Securities
Exchange Act of 1934. All statements, other than statements of historical
facts, included or referenced in this release which address activities, events
or developments which we expect or anticipate will or may occur in the future
are forward-looking statements. The words "will," "believe," "intend,"
"expect," "anticipate," "project," "estimate," "predict" and similar
expressions are also intended to identify forward-looking statements. These
forward-looking statements include, among others, statements with respect to
OneBeacon's:

-- changes in adjusted book value per share or return on equity;
-- business strategy;
-- financial and operating targets or plans;
-- incurred loss and loss adjustment expenses and the adequacy of its
loss
and loss adjustment expense reserves and related reinsurance;
-- projections of revenues, income (or loss), earnings (or loss) per
share,
dividends, market share or other financial forecasts;
-- expansion and growth of our business and operations; and
-- future capital expenditures.

These statements are based on certain assumptions and analyses made by
OneBeacon in light of its experience and perception of historical trends,
current conditions and expected future developments, as well as other factors
believed to be appropriate in the circumstances. However, whether actual
results and developments will conform to our expectations and predictions is
subject to a number of risks and uncertainties that could cause actual results
to differ materially from expectations, including:

-- claims arising from catastrophic events, such as hurricanes,
earthquakes, floods or terrorist attacks;
-- recorded loss and loss adjustment expense reserves subsequently
proving
to have been inadequate;
-- the continued availability and cost of reinsurance coverage;
-- the continued availability of capital and financing;
-- general economic, market or business conditions;
-- business opportunities (or lack thereof) that may be presented to it
and
pursued;
-- competitive forces, including the conduct of other property and
casualty
insurers and reinsurers;
-- changes in domestic or foreign laws or regulations, or their
interpretation, applicable to OneBeacon, its competitors or its
clients;
-- an economic downturn or other economic conditions adversely affecting
its financial position;
-- other factors, most of which are beyond OneBeacon's control; and

-- the risks that are described from time to time in OneBeacon's
filings with the Securities and Exchange Commission, including but not
limited to OneBeacon's Annual Report on the Form 10-K for the
fiscal year ended December 31, 2008 filed February 27, 2009.

Consequently, all of the forward-looking statements made in this press release
are qualified by these cautionary statements, and there can be no assurance
that the actual results or developments anticipated by OneBeacon will be
realized or, even if substantially realized, that they will have the expected
consequences to, or effects on, OneBeacon or its business or operations.
OneBeacon assumes no obligation to update publicly any such forward-looking
statements, whether as a result of new information, future events or
otherwise.

SOURCE OneBeacon Insurance Group

Maggie Sheehan of OneBeacon Insurance Group, +1-781-332-7271,
msheehan@onebeacon.com